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SUBSIDIARIES AND OPERATING SEGMENTS (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of subsidiaries [abstract]  
Schedule of Group's Affiliates and Legal Entities Included in Consolidated Financial Statements
The following Group’s affiliates are legal entities included in the Consolidated Financial Statements of the Group at December 31, 2020.
EntityCountry% Group InterestConsolidation
Method
Cross Operating Segment
Constellium Singen GmbH (AS&I and P&ARP)Germany100 %Consolidated
Constellium Valais S.A. (AS&I and A&T)Switzerland100 %Consolidated
AS&I
Constellium Automotive USA, LLCU.S.100 %Consolidated
Constellium Engley (Changchun) Automotive Structures Co Ltd.China54 %Consolidated
Constellium Extrusions Decin S.r.o.Czech Republic100 %Consolidated
Constellium Extrusions Deutschland GmbHGermany100 %Consolidated
Constellium Extrusions Landau GmbHGermany100 %Consolidated
Constellium Extrusions Burg GmbHGermany100 %Consolidated
Constellium Extrusions France S.A.S.France100 %Consolidated
Constellium Extrusions Levice S.r.o.Slovakia100 %Consolidated
Constellium Automotive Mexico, S. DE R.L. DE C.V.Mexico100 %Consolidated
Constellium Automotive Mexico Trading, S. DE R.L. DE C.V.Mexico100 %Consolidated
Astrex IncCanada50 %Consolidated
Constellium Automotive Zilina S.r.o.Slovakia100 %Consolidated
Constellium Automotive Nanjing Co LtdChina100 %Consolidated
Constellium Automotive Spain SLSpain100 %Consolidated
Constellium UK LimitedUnited Kingdom100 %Consolidated
A&T
Constellium Issoire S.A.S.France100 %Consolidated
Constellium Montreuil Juigné S.A.S.France100 %Consolidated
Constellium China LimitedChina100 %Consolidated
Constellium Japan KKJapan100 %Consolidated
Constellium Rolled Products Ravenswood, LLCU.S.100 %Consolidated
Constellium Ussel S.A.S.France100 %Consolidated
AluInfra Services SA (A)Switzerland50 %Consolidated
P&ARP
Constellium Deutschland GmbHGermany100 %Consolidated
Constellium Rolled Products Singen GmbH KGGermany100 %Consolidated
Constellium Property and Equipment Company, LLCU.S.100 %Consolidated
Constellium Neuf Brisach S.A.S.France100 %Consolidated
Constellium Muscle Shoals LLCU.S.100 %Consolidated
Constellium Holding Muscle Shoals LLCU.S.100 %Consolidated
Constellium Muscle Shoals Funding II LLCU.S.100 %Consolidated
Listerhill Total Maintenance Center LLCU.S.100 %Consolidated
Constellium Metal Procurement LLCU.S.100 %Consolidated
Constellium Bowling Green LLCU.S.100 %Consolidated
RhenarollFrance50 %Equity
Holdings & Corporate
C-TEC Constellium Technology Center S.A.S.France100 %Consolidated
Constellium Finance S.A.S.France100 %Consolidated
Constellium France IIIFrance100 %Consolidated
Constellium France Holdco S.A.S.France100 %Consolidated
Constellium InternationalFrance100 %Consolidated
Constellium Paris S.A.S.France100 %Consolidated
Constellium Germany Holdco GmbH & Co. KGGermany100 %Consolidated
Constellium Germany Verwaltungs GmbHGermany100 %Consolidated
Constellium U.S. Holdings I, LLCU.S.100 %Consolidated
Constellium US Intermediate Holdings LLCU.S.100 %Consolidated
Constellium Switzerland AGSwitzerland100 %Consolidated
Constellium Treuhand UGGermany100 %Consolidated
Engineered Products International S.A.S.France100 %Consolidated
(A)AluInfra Services SA, the joint venture created with Novelis in July 2018, is consolidated as a joint operation and is immaterial to the Group Consolidated Financial Statements